It's three stages that are like those found in a muff. There is no tone stack and two different clipping stages to give a very thick wall of fuzz without loosing much definition or clarity. You can still palm mute and its very smooth for lead lines. Very loud and cutting unlike a muff.
The whole thing has monster bass. Its got giant in and out caps compared to a stock muff and bass is boosted throughout the circuit. Since we ditched the tone circuit that helps a lot too.
It should work well for bass users.